package bobaini.com.config;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;

import java.util.concurrent.Executor;
import java.util.concurrent.ThreadPoolExecutor;

/**
 * @author: liuyi
 * ClassName: Test
 * Version: 1.0.0
 * DateTime: 2021/03/31-10:36:00
 * Description: 使用@Configuration和@EnableAsync这两个注解，表示这是个配置类，并且是线程池的配置类
 */
@EnableAsync
@Configuration
public class ExecutorConfig {

    private static final Logger logger = LoggerFactory.getLogger(ExecutorConfig.class);

    public static final int CORE_POOL_SIZE = 20;
    private static final int MAX_POOL_SIZE = 50;
    private static final int QUEUE_CAPACITY = 100;
    private static final int KEEP_ALIVE_SECONDS = 30;

    @Bean(name = "asyncServiceExecutor")
    public Executor getAsyncExecutor() {
        logger.info("start asyncServiceExecutor");

        ThreadPoolTaskExecutor executor = new VisiableThreadPoolTaskExecutor();
        //核心线程池大小
        executor.setCorePoolSize(CORE_POOL_SIZE);
        //最大线程数
        executor.setMaxPoolSize(MAX_POOL_SIZE);
        //队列容量
        executor.setQueueCapacity(QUEUE_CAPACITY);
        //活跃时间
        executor.setKeepAliveSeconds(KEEP_ALIVE_SECONDS);
        //设置线程池关闭的时候等待所有任务都完成再继续销毁其他的Bean
        executor.setWaitForTasksToCompleteOnShutdown(true);
        //线程名字前缀
        executor.setThreadNamePrefix("liu-async-");
        // setRejectedExecutionHandler：当pool已经达到max size的时候，如何处理新任务
        // CallerRunsPolicy：不在新线程中执行任务，而是由调用者所在的线程来执行
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
        executor.initialize();
        return executor;
    }

}

